To calculate dome volume: first, position the piston a measured distance into the cylinder, making sure the dome is below the deck. In this example, the piston is 0.150-inch in the hole.

Cylinder The volume of a cylinder is π × r² × l (r is the radius of the circle and l is the length of the cylinder). To calculate the volume we multiply these values together.

A compression ratio calculation is pretty straightforward, but involves a little math. So, grab your calculator and let’s crunch some numbers.